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## org.hyperic.image.chart
Class Chart

    java.lang.Object
      org.hyperic.image.WebImage
          org.hyperic.image.chart.Chart

Direct Known Subclasses:
  AvailabilityReportChart, HorizontalChart, VerticalChart

    public abstract class Chart

extends WebImage

Chart is an abstract base class for the Covalent charting library. Chart uses Java AWT drawing to draw charts dynamically into a Java Image which can be then be used to display the chart in an application. The most common use of the charting library is to draw the chart image and then convert the image to a GIF to send to a Web Browser. Chart is responsible for all of the background drawing of the Chart the Chart frame, text labels, data point crossing lines, etc. Sublcasses of Chart draw on top of the image produce by the Chart class to draw the actual lines, columns, etc. that represent the data points of the chart. To create a chart you instantiate a subclass of Chart (e.g., LineChart, ColumnChart, etc.), call getData() to retrieve a collection, poplulate the collection and then call Chart.getImage() to get a java.awt.Image object that represents the drawn chart. The chart class is very configurable through get/set methods including configuring things like the text for labels, fonts, line colors, etc. After changing one or more options you call Chart.getImage() again to get a new image based on your options. The chart should have at least three datums in its Datum collection to display without errors.

See Also:
  `Image`

Field Summary
`protected static java.lang.String` | `ARG_MUST_BE_ZERO_OR_GREATER`
`java.awt.Color` | `averageLineColor` Color of the average data point horizontal line.
`protected static java.lang.String` | `AVG`
`double` | `baseline` Baseline in the chart.
`protected static java.lang.String` | `BASELINE`
`java.awt.Color` | `baselineColor` Color of the baseline horizontal line.
`double` | `ceiling` Top number for the left axis of the chart.
`java.awt.Color` | `chartColor` Retrieves the chart's interior background color.
`protected static java.awt.Font` | `DEFAULT_LABEL_FONT`
`protected static java.awt.Font` | `DEFAULT_LEGEND_FONT`
`protected static java.awt.Font` | `DEFAULT_LEGEND_PLAIN`
`protected static java.lang.String` | `DEFAULT_UNIT_LEGEND`
`protected static java.lang.String` | `DEFAULT_VALUE_LEGEND`
`static java.lang.String` | `EMPTY_STRING`
`double` | `floor` Bottom number for the left axis of the chart.
`double` | `highRange` High range in the chart.
`java.awt.Color` | `highRangeColor` High range color in the chart.
`java.awt.Font` | `legendFont` Font that is used to draw the legend for the chart's X and Y axis.
`java.awt.Color` | `legendTextColor` Color that is used to draw the legend text for the chart's X and Y axis.
`int` | `lineWidth` Width of lines in the chart.
`protected static java.lang.String` | `LOW`
`java.awt.Color` | `lowLineColor` Retrieves the color of the low data point horizontal line.
`double` | `lowRange` Low range in the chart.
`java.awt.Color` | `lowRangeColor` High range color in the chart.
`protected double[]` | `m_adRangeMarks`
`protected boolean` | `m_bNoData`
`protected double` | `m_dAvgValue`
`protected double` | `m_dLowValue`
`protected double` | `m_dPeakValue`
`protected double` | `m_floor`
`protected int` | `m_fmtScale`
`protected int` | `m_fmtType`
`protected java.awt.FontMetrics` | `m_metricsLabel`
`protected java.awt.FontMetrics` | `m_metricsLegend`
`protected static java.lang.String` | `PEAK`
`java.awt.Color` | `peakLineColor` Color of the peak data point horizontal line.
`int` | `rightLabelWidth` Sets a fixed size for the label width on the right vertical axis.
`boolean` | `showAverage` Calculates and shows an Average line in the chart.
`boolean` | `showBaseline` Shows a Baseline in the chart.
`boolean` | `showBottomLabels` Shows labels on the X axis bottom side.
`boolean` | `showBottomLegend` Shows a top legend.
`boolean` | `showEvents` Shows events plotted on a chart.
`boolean` | `showFullLabels` Show full labels on the bottom x axis.
`boolean` | `showHighRange` Shows a shaded high range in the chart.
`boolean` | `showLeftLabels` Shows labels on the Y axis left side.
`boolean` | `showLeftLegend` Shows a Left legend.
`boolean` | `showLow` Calculates and shows a Low line in the chart.
`boolean` | `showLowRange` Shows a shaded low range in the chart.
`boolean` | `showPeak` Calculates and shows a peak line in the chart.
`boolean` | `showRightLabels` Shows labels on the Y axis right side.
`boolean` | `showRightLegend` Shows a Right legend.
`boolean` | `showTopLabels` Shows labels on the X axis top side.
`boolean` | `showTopLegend` Shows a top legend.
`boolean` | `showUnitLines` Shows vertical crossing lines at each data point on the y axis.
`boolean` | `showValueLines` Shows horizontal crossing lines at each data point on the x axis.
`boolean` | `showValues` Shows values.
`int` | `textWhitespace` The width of the white space between tick marks and the label text.
`int` | `tickMarkHeight` The height, in pixels, of the tick mark lines that extend outside the chart's border.
`int` | `valueIndent` Number of pixels to indent the value axis.
`int` | `valueLines` Number of value lines that the chart draws at data points along the chart's value axis.
`protected static int` | `VARIABLE_HEIGHT`
`protected static int` | `VARIABLE_WIDTH`
`int` | `x2VertLabels`
`int` | `x2VertMarks`
`int` | `xLabelsSkip`
`java.awt.Color` | `xLineColor` Color of the border lines, horizontal lines and tick marks
`int` | `xOffset` Amount to offset the chart on the X axis in pixels.
`int` | `xRLabel`
`int` | `xVertLegend`
`int` | `xVertMarks`
`int` | `yBottomLegend`
`int` | `yHorzLabels`
`int` | `yOffset` Amount to offset the chart on the Y axis in pixels.
`int` | `yTopLegend`

Fields inherited from class org.hyperic.image.WebImage
`antiAliased, ARG_CANNOT_BE_NULL, backgroundColor, bottomBorder, DEFAULT_BACKGROUND_COLOR, DEFAULT_BOLD_TYPEFACE, DEFAULT_BORDER_COLOR, DEFAULT_BORDER_SIZE, DEFAULT_FONT, DEFAULT_FONT_METRICS, DEFAULT_HEIGHT, DEFAULT_PLAIN_TYPEFACE, DEFAULT_SHADOW_WIDTH, DEFAULT_WIDTH, font, frameImage, height, indexColors, leftBorder, m_graphics, rightBorder, shadowWidth, SMALL_FONT, textColor, topBorder, width`

Constructor Summary
`protected` | `Chart()` Constructs a Chart class with a default width of 755 pixels and a default height of 300 pixels.
`protected` | `Chart(int charts)` Constructs a Chart class with a default width of 755 pixels and a default height of 300 pixels.
`protected` | `Chart(int width, int height)` Constructs a Chart class with a specified width and height.
`protected` | `Chart(int width, int height, int charts)` Constructs a Chart class with a specified width and height.

Method Summary
`protected java.awt.Rectangle` | `adjustRectangle(java.awt.Graphics2D g, java.awt.Rectangle rect)` Give the child class an opportunity to change the size of the interior rectangle.
`protected void` | `calc(java.awt.Graphics2D g)`
`protected void` | `calcRanges()` Calculates the high, low and average values of the chart data set.
`protected int` | `calcVariableHeight()`
`protected int` | `calcVariableWidth()`
`protected boolean` | `checkHighLow()`
`protected java.awt.Rectangle` | `draw(ChartGraphics g)`
`protected void` | `draw(java.awt.Graphics2D g)`
`double` | `getAverageValue()` Retrieves the average value of the chart's data set.
`protected java.lang.Class` | `getDataCollectionClass()`
`protected java.awt.Point` | `getDataPoint(int valuePixels, int unitPixels, int datapoint, DataPointCollection coll)` Retrieves the value and unit coordinate for a data point in the chart.
`DataPointCollection` | `getDataPoints()` Retrieves the data set of the chart.
`DataPointCollection` | `getDataPoints(int index)`
`int` | `getDataSetCount()`
`java.util.Iterator` | `getDataSetIterator()`
`protected java.awt.Point` | `getDisplayPoint(int valuePixels, int unitPixels, int unitPoints, double value, int unitIndex)` Retrieves the value and unit coordinate for a value on the x and y axis in the chart.
`EventPointCollection` | `getEventPoints()`
`EventPointCollection` | `getEventPoints(int index)`
`java.util.Iterator` | `getEventSetIterator()`
`protected int` | `getExteriorHeight()`
`java.awt.Rectangle` | `getExteriorRectangle()`
`protected abstract java.awt.Rectangle` | `getInteriorRectangle(ChartGraphics g)`
`double` | `getLowValue()` Retrieves the low value of the chart's data set.
`java.lang.String` | `getNoDataString()`
`double` | `getPeakValue()` Retrieves the peak value of the chart's data set.
`java.lang.String` | `getTitle()` Get the chart's title.
`protected java.lang.String` | `getUnitLabel(IDisplayDataPoint data)`
`java.lang.String` | `getUnitLegend()` Retrieves the legend for the chart's Unit axis.
`java.lang.String` | `getValueLegend()` Retrieves the legend for the chart's Value axis.
`protected int` | `getXLabelHeight()`
`protected abstract java.lang.String[]` | `getXLabels()`
`protected int` | `getXLabelWidth()` Calculates the label width of the horizontal axis of the chart.
`protected int` | `getXLegendHeight()`
`protected abstract int` | `getYLabelWidth(java.awt.Graphics2D g)` Calculates the label width of the vertical axis of the chart.
`protected boolean` | `hasData()`
`protected java.util.Collection` | `initData(java.util.Collection coll)`
`protected void` | `initFonts()`
`protected void` | `postInit(java.awt.Graphics2D g)`
`protected void` | `preInit()`
`protected double` | `scale(int height)` Calculates the scale of the graph data points.
`void` | `setAbsTimeLabels(boolean useAbsTimeLabels, long interval)`
`void` | `setFormat(int type, int scale)`
`void` | `setNoDataString(java.lang.String s)`
`void` | `setNumberDataSets(int number)`
`void` | `setTitle(java.lang.String title)` Set the chart's title.
`void` | `setUnitLegend(java.lang.String legend)` Sets the legend for the chart's Unit axis.
`void` | `setValueLegend(java.lang.String legend)` Sets the legend for the chart's Value axis.

Methods inherited from class org.hyperic.image.WebImage
`getFontMetrics, getImage, getTextCenter, getTextCenter, getTextCenter, isRunnable, setBorder, writeJpegImage, writeJpegImage, writePngImage, writePngImage`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### EMPTY_STRING

    public static final java.lang.String EMPTY_STRING

See Also:
  Constant Field Values

### ARG_MUST_BE_ZERO_OR_GREATER

    protected static final java.lang.String ARG_MUST_BE_ZERO_OR_GREATER

See Also:
  Constant Field Values

### AVG

    protected static final java.lang.String AVG

See Also:
  Constant Field Values

### BASELINE

    protected static final java.lang.String BASELINE

See Also:
  Constant Field Values

### LOW

    protected static final java.lang.String LOW

See Also:
  Constant Field Values

### PEAK

    protected static final java.lang.String PEAK

See Also:
  Constant Field Values

### DEFAULT_UNIT_LEGEND

    protected static final java.lang.String DEFAULT_UNIT_LEGEND

See Also:
  Constant Field Values

### DEFAULT_VALUE_LEGEND

    protected static final java.lang.String DEFAULT_VALUE_LEGEND

See Also:
  Constant Field Values

### VARIABLE_HEIGHT

    protected static final int VARIABLE_HEIGHT

See Also:
  Constant Field Values

### VARIABLE_WIDTH

    protected static final int VARIABLE_WIDTH

See Also:
  Constant Field Values

### DEFAULT_LABEL_FONT

    protected static final java.awt.Font DEFAULT_LABEL_FONT

### DEFAULT_LEGEND_PLAIN

    protected static final java.awt.Font DEFAULT_LEGEND_PLAIN

### DEFAULT_LEGEND_FONT

    protected static final java.awt.Font DEFAULT_LEGEND_FONT

### m_metricsLabel

    protected java.awt.FontMetrics m_metricsLabel

### m_metricsLegend

    protected java.awt.FontMetrics m_metricsLegend

### m_fmtType

    protected int m_fmtType

### m_fmtScale

    protected int m_fmtScale

### m_dAvgValue

    protected double m_dAvgValue

### m_dLowValue

    protected double m_dLowValue

### m_dPeakValue

    protected double m_dPeakValue

### m_adRangeMarks

    protected double[] m_adRangeMarks

### m_floor

    protected double m_floor

### m_bNoData

    protected boolean m_bNoData

### yTopLegend

    public int yTopLegend

### yBottomLegend

    public int yBottomLegend

### xVertLegend

    public int xVertLegend

### yHorzLabels

    public int yHorzLabels

### x2VertLabels

    public int x2VertLabels

### xRLabel

    public int xRLabel

### xVertMarks

    public int xVertMarks

### x2VertMarks

    public int x2VertMarks

### xLabelsSkip

    public int xLabelsSkip

### averageLineColor

    public java.awt.Color averageLineColor

  Color of the average data point horizontal line.

### baselineColor

    public java.awt.Color baselineColor

  Color of the baseline horizontal line.

### ceiling

    public double ceiling

  Top number for the left axis of the chart.

### chartColor

    public java.awt.Color chartColor

  Retrieves the chart's interior background color.

### floor

    public double floor

  Bottom number for the left axis of the chart.

### baseline

    public double baseline

  Baseline in the chart.

### highRange

    public double highRange

  High range in the chart.

### highRangeColor

    public java.awt.Color highRangeColor

  High range color in the chart.

### legendFont

    public java.awt.Font legendFont

  Font that is used to draw the legend for the chart's X and Y axis.

### legendTextColor

    public java.awt.Color legendTextColor

  Color that is used to draw the legend text for the chart's X and Y axis.

### lineWidth

    public int lineWidth

  Width of lines in the chart.

### lowLineColor

    public java.awt.Color lowLineColor

  Retrieves the color of the low data point horizontal line.

### lowRange

    public double lowRange

  Low range in the chart.

### lowRangeColor

    public java.awt.Color lowRangeColor

  High range color in the chart.

### peakLineColor

    public java.awt.Color peakLineColor

  Color of the peak data point horizontal line.

### rightLabelWidth

    public int rightLabelWidth

  Sets a fixed size for the label width on the right vertical axis.

### showAverage

    public boolean showAverage

  Calculates and shows an Average line in the chart.

### showBaseline

    public boolean showBaseline

  Shows a Baseline in the chart.

### showBottomLabels

    public boolean showBottomLabels

  Shows labels on the X axis bottom side.

### showBottomLegend

    public boolean showBottomLegend

  Shows a top legend.

### showEvents

    public boolean showEvents

  Shows events plotted on a chart.

### showFullLabels

    public boolean showFullLabels

  Show full labels on the bottom x axis.

### showHighRange

    public boolean showHighRange

  Shows a shaded high range in the chart.

### showLeftLabels

    public boolean showLeftLabels

  Shows labels on the Y axis left side.

### showLeftLegend

    public boolean showLeftLegend

  Shows a Left legend.

### showLow

    public boolean showLow

  Calculates and shows a Low line in the chart.

### showLowRange

    public boolean showLowRange

  Shows a shaded low range in the chart.

### showPeak

    public boolean showPeak

  Calculates and shows a peak line in the chart.

### showRightLabels

    public boolean showRightLabels

  Shows labels on the Y axis right side.

### showRightLegend

    public boolean showRightLegend

  Shows a Right legend.

### showTopLabels

    public boolean showTopLabels

  Shows labels on the X axis top side.

### showTopLegend

    public boolean showTopLegend

  Shows a top legend.

### showUnitLines

    public boolean showUnitLines

  Shows vertical crossing lines at each data point on the y axis.

### showValueLines

    public boolean showValueLines

  Shows horizontal crossing lines at each data point on the x axis.

### showValues

    public boolean showValues

  Shows values.

### textWhitespace

    public int textWhitespace

  The width of the white space between tick marks and the label text.

### tickMarkHeight

    public int tickMarkHeight

  The height, in pixels, of the tick mark lines that extend outside the chart's border. The tick marks for data points that don't have a label are drawn at half this height.

### valueIndent

    public int valueIndent

  Number of pixels to indent the value axis.

### valueLines

    public int valueLines

  Number of value lines that the chart draws at data points along the chart's value axis. For vertical chart's this is the Y axis. For horizontal charts this is the chart's X axis. This number includes the chart's top and bottom border.

### xLineColor

    public java.awt.Color xLineColor

  Color of the border lines, horizontal lines and tick marks

### xOffset

    public int xOffset

  Amount to offset the chart on the X axis in pixels.

### yOffset

    public int yOffset

  Amount to offset the chart on the Y axis in pixels.

Constructor Detail

### Chart

    protected Chart()

  Constructs a Chart class with a default width of 755 pixels and a default height of 300 pixels.

### Chart

    protected Chart(int charts)

  Constructs a Chart class with a default width of 755 pixels and a default height of 300 pixels.

  Parameters:
    `charts` - The number of charts to display.

### Chart

    protected Chart(int width,
                    int height)

  Constructs a Chart class with a specified width and height.

  Parameters:
    `width` - The width of the chart in pixels.
    `height` - The height of the chart in pixels.

### Chart

    protected Chart(int width,
                    int height,
                    int charts)

  Constructs a Chart class with a specified width and height.

  Parameters:
    `width` - The width of the chart in pixels.
    `height` - The height of the chart in pixels.
    `charts` - The number of charts to display.

Method Detail

### draw

    protected void draw(java.awt.Graphics2D g)

  Overrides:
    `draw` in class `WebImage`

### draw

    protected java.awt.Rectangle draw(ChartGraphics g)

### calc

    protected void calc(java.awt.Graphics2D g)

### adjustRectangle

    protected java.awt.Rectangle adjustRectangle(java.awt.Graphics2D g,
                                                 java.awt.Rectangle rect)

  Give the child class an opportunity to change the size of the interior rectangle. This is done to make the tick marks fit symetrically in the chart rectangle.

### calcRanges

    protected void calcRanges()

  Calculates the high, low and average values of the chart data set.

### calcVariableHeight

    protected int calcVariableHeight()

### calcVariableWidth

    protected int calcVariableWidth()

### getXLabelWidth

    protected int getXLabelWidth()

  Calculates the label width of the horizontal axis of the chart.

  Parameters:
    `graph` - The java.awt.Graphics context to draw into.
  Returns:
    The width of the widest label on the X (horizontal) axis.

### getXLegendHeight

    protected int getXLegendHeight()

### getYLabelWidth

    protected abstract int getYLabelWidth(java.awt.Graphics2D g)

  Calculates the label width of the vertical axis of the chart.

  Parameters:
    `graph` - The ChartGraphics context to draw into.
  Returns:
    The width of the widest label on the Y (vertical) axis.

### getXLabels

    protected abstract java.lang.String[] getXLabels()

### getXLabelHeight

    protected int getXLabelHeight()

### getInteriorRectangle

    protected abstract java.awt.Rectangle getInteriorRectangle(ChartGraphics g)

### getExteriorHeight

    protected int getExteriorHeight()

### initData

    protected java.util.Collection initData(java.util.Collection coll)

### initFonts

    protected void initFonts()

### preInit

    protected void preInit()

  Overrides:
    `preInit` in class `WebImage`

### postInit

    protected void postInit(java.awt.Graphics2D g)

  Overrides:
    `postInit` in class `WebImage`

### getDataPoint

    protected java.awt.Point getDataPoint(int valuePixels,
                                          int unitPixels,
                                          int datapoint,
                                          DataPointCollection coll)

  Retrieves the value and unit coordinate for a data point in the chart.

  Parameters:
    `valuePixels` - An int that specifies the size of the value axis in pixels.
    `unitPixels` - An int that specifies the size of the unit axis in pixels.
    `datapoint` - An int that specifies the zero-based index of the datum to calculate coordinates for.
    `collection` - The DataPointCollection the datapoint is located in.
  Returns:
    A java.awt.Point object that contains the X and Y coordinate.
  See Also:
    `Rectangle`

### getDisplayPoint

    protected java.awt.Point getDisplayPoint(int valuePixels,
                                             int unitPixels,
                                             int unitPoints,
                                             double value,
                                             int unitIndex)

  Retrieves the value and unit coordinate for a value on the x and y axis in the chart.

  Parameters:
    `valuePixels` - An int that specifies the size of the value axis in pixels.
    `unitPixels` - An int that specifies the size of the unit axis in pixels.
    `unitPoints` - Number of ticks on the unit axis.
    `value` - A double that specifies the value to get coordinates for.
    `unitIndex` - Ticks on the unit axis to get coordinates for.
  Returns:
    A java.awt.Point object that contains the X and Y coordinate.

### getUnitLabel

    protected java.lang.String getUnitLabel(IDisplayDataPoint data)

### hasData

    protected boolean hasData()

### scale

    protected double scale(int height)

  Calculates the scale of the graph data points. This is the number of pixels per data point.

  Parameters:
    `height` - The height of the rectangle to calculate the vertical scale for.
  Returns:
    A floating point value that specifies the scale multiplier of the vertical axis.

### getDataCollectionClass

    protected java.lang.Class getDataCollectionClass()

### checkHighLow

    protected boolean checkHighLow()

### getAverageValue

    public double getAverageValue()

  Retrieves the average value of the chart's data set.

  Returns:
    A floating point value that is the average value of the chart's data set.

### getNoDataString

    public java.lang.String getNoDataString()

### setNoDataString

    public void setNoDataString(java.lang.String s)

### getDataPoints

    public DataPointCollection getDataPoints()

  Retrieves the data set of the chart.

  Returns:
    A net.hyperic.chart.DataPointCollection object that contains the current data set points.
  See Also:
    `net.hyperic.chart.DataPointCollection`

### getEventPoints

    public EventPointCollection getEventPoints()

### getDataPoints

    public DataPointCollection getDataPoints(int index)

### getEventPoints

    public EventPointCollection getEventPoints(int index)

### getDataSetCount

    public int getDataSetCount()

### getDataSetIterator

    public java.util.Iterator getDataSetIterator()

### getEventSetIterator

    public java.util.Iterator getEventSetIterator()

### setNumberDataSets

    public void setNumberDataSets(int number)

### setFormat

    public void setFormat(int type,
                          int scale)

### getExteriorRectangle

    public java.awt.Rectangle getExteriorRectangle()

### getLowValue

    public double getLowValue()

  Retrieves the low value of the chart's data set.

  Returns:
    A floating point value that is the low value of the chart's data set.

### getPeakValue

    public double getPeakValue()

  Retrieves the peak value of the chart's data set.

  Returns:
    A floating point value that is the peak value of the chart's data set.

### getTitle

    public java.lang.String getTitle()

  Get the chart's title.

  Returns:
    A string containing the chart's title.

### setTitle

    public void setTitle(java.lang.String title)

  Set the chart's title.

  Parameters:
    `title` - A string containing the chart's title.

### getUnitLegend

    public java.lang.String getUnitLegend()

  Retrieves the legend for the chart's Unit axis. The default legend is "TIME".

  Returns:
    A java.lang.String object that contains the chart's Unit axis lagend.

### setUnitLegend

    public void setUnitLegend(java.lang.String legend)

  Sets the legend for the chart's Unit axis.

  Parameters:
    `label` - A java.lang.String object that contains the chart's Unit axis legend.
  Throws:
    `java.lang.IllegalArgumentException` - If the legend parameter is null.

### getValueLegend

    public java.lang.String getValueLegend()

  Retrieves the legend for the chart's Value axis. The default legend is "VALUE".

  Returns:
    A java.lang.String object that contains the chart's Value axis legend.

### setValueLegend

    public void setValueLegend(java.lang.String legend)

  Sets the legend for the chart's Value axis.

  Parameters:
    `label` - A java.lang.String object that contains the chart's Value axis legend.
  Throws:
    `java.lang.IllegalArgumentException` - If the legend parameter is null.

### setAbsTimeLabels

    public void setAbsTimeLabels(boolean useAbsTimeLabels,
                                 long interval)

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